LeCun and colleagues (Neural Computation, 1989) report applying a backpropagation network to handwritten zip code digits provided by the U.S. Postal Service, with a single network going from the normalised character image to the final classification.
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Backpropagation Applied to Handwritten Zip Code Recognition → states provision → A backpropagation network applied to handwritten zip code digits from the U.S. Mail
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